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The crankshaft pulley is the only other pulley that requires upgrading to eight-rib. Kenne Bell offers a stock-diameter piece that is machined with two additional ribs, but we’re using ATI’s 10-percent overdrive crank damper on Andy’s Boss. Previous tests on Coyote-5.0 ’Stangs have found the larger-diameter pulley is necessary when boost exceeds 15 psi.